Global Patent Index - EP 0287743 A1

EP 0287743 A1 19881026 - Echo cancelling device with phase-roll correction.

Title (en)

Echo cancelling device with phase-roll correction.

Title (de)

Echokompensationseinrichtung mit Korrektur von Phasenabweichungen.

Title (fr)

Dispositif d'annulation d'échos avec correction de la variation de phase.

Publication

EP 0287743 A1 19881026 (EN)

Application

EP 87430015 A 19870422

Priority

EP 87430015 A 19870422

Abstract (en)

Echo cancelling device for providing an echo-free incoming data signal with a phase-roll tracking device comprising phase rotating means (58) for rotating the phase of the generated echo signal by a value X which is the estimated phase-roll value, thereby providing a complex phase-roll corrected echo signal a multiplier (124) for multiplying the error signal between the incoming signal and the real component (112) of the phase-roll corrected echo signal by the imaginary component (120) of the same signal, thereby providing a value Y function of the variation of the phase-roll; a phase-roll variation estimator (128) providing an estimation Z of the phase-roll variation X in half duplex mode or in full duplex mode, in response to value Y; and a phase filter (126) providing the estimated phase-roll value X in response to the estimation Z.

IPC 1-7

H04B 3/23

IPC 8 full level

H04L 5/14 (2006.01); H04B 3/23 (2006.01)

CPC (source: EP US)

H04B 3/232 (2013.01 - EP US); H04B 3/237 (2013.01 - EP US); H04B 3/238 (2013.01 - EP US)

Citation (search report)

  • [X] EP 0036696 A1 19810930 - TRT TELECOM RADIO ELECTR [FR]
  • [Y] WO 8300266 A1 19830120 - WESTERN ELECTRIC CO [US]
  • [Y] PATENT ABSTRACTS OF JAPAN, vol. 8, no. 167 (E-258)[1604], 2nd August 1984; & JP-A-59 063 827 (TOSHIBA K.K.) 11-04-1984
  • [A] PATENT ABSTRACTS OF JAPAN, vol. 9, no. 140 (E-321)[1863], 14th June 1985; & JP-A-60 021 639 (TOSHIBA K.K.) 04-02-1985

Designated contracting state (EPC)

DE FR GB IT

DOCDB simple family (publication)

EP 0287743 A1 19881026; EP 0287743 B1 19930303; DE 3784490 D1 19930408; DE 3784490 T2 19930916; JP H0758924 B2 19950621; JP S63274227 A 19881111; US 4887258 A 19891212

DOCDB simple family (application)

EP 87430015 A 19870422; DE 3784490 T 19870422; JP 3545288 A 19880219; US 16430588 A 19880304